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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9293a0cf29d2aba1cafe40d657327f95aa5769bfc4b4c74bfcebe18c66bc009d' 
  AND token = 'Bo6yxEbKeSafx1tWP1GbQ2r1WXl7xZUIHFMAOztj2Qw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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