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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69e26d227919b3fb6f5285deb3e032977bf14f1408534f7f2600d4049153879e' 
  AND token = 'flL9X1Ah326iYffeTV9yYV8jwkrqTmhTPWni8FWvfSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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