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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d24149b264fc92baea2f0698bde52e916331a199c314acd58c682897d66503c' 
  AND token = '2sv3WjEx9/FLDIN01Lu08j5zsTgg5Ilundke4FXXbaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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