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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd19c1e40c13281890902d4774dde475b9c184881f441ac1b41e8acc9189a67fa' 
  AND token = '1GQzdunTyXRsRpFbQuIl16f4/jAwWpUo6MK/8hV4mNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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