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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efe82b9b0e4b8abb9810b725f689a96421b8e728a0eafebc333a858f45025264' 
  AND token = 'k5PoaZUrycw9gxsQyFcR3eT82U1EpYcjsoCTSuOZKw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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