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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c6880a2ecbbe084bf78b9f36b1b798497f9d31b99df9a677af2c58b4c181099' 
  AND token = 'XolcByAH7fu6dP675JrRwOjnMD/EoKu3roM2PskgZhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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