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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbc2c882e56fbc22dc13d1d50638507445179626fadbaa87667032499066b566' 
  AND token = 'eA/JlNry3zUo1L7cLe2otvVI4zeMDsRRgsXIWj/I2ik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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