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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caac0ebf67d930a91da3be686cb65f7f1520335a12a5d4c64f18f42fbf173355' 
  AND token = 'XqhIiwLkUY/MylW6Twel6VOHDazfAls1PhlQ+ihtu08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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