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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02bf8eac1924b1664ae1a08517922a74e6f9c5cad3a706aa611ba5e324633e25' 
  AND token = 'cvZN+YZmz+zUS9a85Q9t6hfXB8cdoVu1uAFwP23mKjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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