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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a977c943491ec6a5199d88472328ff9d539da7604faff73ca2a383d2a31421e' 
  AND token = 'chLSKgptojGUFegl/E7qBoqtf/9OjIg7nfnQ1DZUNRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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