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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0703b0d217abe45373668206bb3dc58e2d77725a9717a0ee67ee8d1ae57f756d' 
  AND token = 'rflwSFTrTg7UctoZurGzWarJvzQkeIljJe7cf3cuJkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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