SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '180ed7310755a72b9dfb8aa98c84f465b496679321c92fdb8deb483dfcd985f1' 
  AND token = 'mL6ywwmBwl05JgVEsb+/AxGlomJLOJuvLJPeVxf2qUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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