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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e69a6f1c4e796020a5c12b10ce94b08f5f853568fedb7f63a99d1826d862bc99' 
  AND token = 'OYAQ61c7znd9o5fJ0XILOo3QGdpuIHy4TukqquJDS4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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