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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f578ded38e6e7b9bad83d38f80d2e9e47c4c2ba6945172659a68af3be290fb17' 
  AND token = 'LT40DskFbAESOWxWqIrWlvHIxoxinees1Dts3vqVeZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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