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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb264746da5b9c7523d20621d2ca759b2b2bf7afff2078b8f90c8841bd47f541' 
  AND token = 'ca+hW31+77OSsyH4G7ZXoBup6VaU47j5Hdsel4Wpq80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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