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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc81b0ed0ce6f3b39c701e8c9a63cbe3e324bd80896f547fb8d451a3d83bc13e' 
  AND token = 'A6LEeNK7BVp5TtTemXtTJ8AN9iOOJ5TWRWgGbvsl46E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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