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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac38c033a70c8f143dbc5f27e3a752524b68498b5f24c11f0f06d0f3489de04f' 
  AND token = 'C6M7il+yLmwfKHcCKJCxkIsgugaE8JoFe/B1dC9J5P4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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