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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a9642d5a11eb6b10c61a3637f8d85f5ea1ee2a1759bab04ab8d81d100cf661b' 
  AND token = 'auIJLkPoniAZGJIHSSiojPyh54p4lV8Gk/feSgiA7R8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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