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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ad30b8c7dd3ac4fab5952d8e2e7354ee0d8aa7764eca05b799607a102579e22' 
  AND token = '6B8u+f/0uRkc25V9nukDzmvdxq16lf2iCi9VYoXYCv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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