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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce0275683d5a8c73d226d77667de0c47aa9fcbf03f613d03592d5e33a49180ad' 
  AND token = '/DKB2JqgdOK5ykTk0OVHWXtvwKE7YDBAhtnw4k3p1Rk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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