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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a43c59883eac09d4639d3314a4930e3f189fca35ff39b25cce362d030af03d45' 
  AND token = 'UtHweD95VIXK5beSwpuOK5vIQlGfS9qDAJH3EHIG7oU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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