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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd0c11be550cfbc2353c6b623192eafd1e9c71b7fcc563f6103498904c2cf56b' 
  AND token = 'An5fMvgx4q0ktX0ceQHoBxecx+Iz3tUaAFThxTj/6MU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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