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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fad7a3d98c9d155a6ac5e93c6e727649b7cbf2aedbaa21b4c188cdb789dd712' 
  AND token = 'cmZiVHe57vie28UaalcLCufK2Rw5GZTnk1ezwba3cSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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