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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bc198c7d2c59a551fe7bd4b860a0ad1d1b139b7ad31f5ffb7e860caef62c470' 
  AND token = 'An90EL0m0EZJalJqmg+Xn8k1vh2l8CAKE1UYQFEOO1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}