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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3cbca25335c65c7239bf953579fc2f94c3f23198511a8645b6954ac97cfc4cf' 
  AND token = 'nRhkjCUeUxvXhWYrCuob3QSjC3gei3VDEBCMQRRiATo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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