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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c066c5e9f2b56a57be1c1f4b8120b6d2367f60f12470f7b8abcabc05e1920ff' 
  AND token = 'YJr38vlyx9AxkEPIpsroS5ehzwDxm7iClarnpUI7xsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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