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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b91cc238531145373fa2eef04e200a9d57a2e1f2edb9f90e829cd0a2712e03b2' 
  AND token = 'MAlHIy5w1zXJSdFp4rPhMQa99ESUO4kb92tqdk+UlBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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