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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e90bd3711bfd65c09fb214c10942131e4b090b01a1b95304a1969effa3bd638' 
  AND token = '6I6C97ghJ1i8mEyEI2e1RcqRotGZ2CJW6MoB23kjRq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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