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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae28429bee36dde807325068c58eea596eba4c17b5eb15f4397245474e0fec02' 
  AND token = 'CJCeXylA+e+8qRGxCpFGu+tDpmdcXb1qchYxdDg0+Do=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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