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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03a7cf8b351b976f46011ef35f59d62db02faa652ba00f9da725c2646f95a833' 
  AND token = '98KKPgW994iUzmoYYgq598QW7KOrXY8PWjsnR1CcHVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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