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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31188f70c38eee2579a828dda31cc4b460ba39c617bc2ec62a538e0fc1e92f3f' 
  AND token = 'pqcqbbfpeoltLEvxKT3dRCmAWiwIFd/03V6nddSuo8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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