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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ec0d7fb1d5aa4e341b7757fb106b8142d297f45b5ccdcafc3f5eb7abba7e543' 
  AND token = 'v8/uSqP7mtiR/uo+o8Yq5ZDdcuftJ8BBZKj+t1+d1sY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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