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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63668f5af74dff07649b55a8ed6d075126d68253c5825d01906d0b670280ad4d' 
  AND token = 'Fs4Ohw662VIkwASSLLrZtUdZQ/El0x5vFgz9UwMJ934=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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