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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6564eb1124031ee0f3bd33cff7f7983702f5a13283ff16f4c36325180080e006' 
  AND token = 'L81nqQOIFpVoeUYi0tihyoqU4Xs3CuGEI8xtdwf/7XU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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