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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f802226d489c32ed4e909d3434e9e8e9751f45d5bfd150dd9b935f8c9f3427a' 
  AND token = 'hJAddkL/bowYgxYIh7kXBL5T6iD/Zhasw2TIDb5j26w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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