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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4938e5315daf4f1c250ee619ad7556dd0414025e62af7f64b07704d4e8e0a522' 
  AND token = 'o1HGz5m1a889nNc8j4hy4qOLBbXAkVpJwbjKULae7fY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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