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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27664fd2faf0543c92ee83e5d59673cceac83925f631668fa9c0eecbaccce2d2' 
  AND token = '9o46Ju3cGgFh5Oe2K2KGHFEbuZSwH10pXbgv/4j/J5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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