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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0dc51ddd97749b3f6dd63e9ff4a5ae1f2c255e1c6d0212df3a653480207e97d' 
  AND token = 'TGdMZ9sCZAxGU80tTkuq1++iLR4L8gGpRBbMbhYPt0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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