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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f5d4d3ffe09c9fec61856248e4ddd792aa263bf0d1160d03dffefd93c6651f3' 
  AND token = '8+tfnjITm8S/eBN6m7UIJC4mRMFwIU/l7d5dh02MRBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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