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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc8fbe06127f77ef1f07dad0fec05e27f23944b89b7ba7864042df7e3c44258d' 
  AND token = 'ex7a1Hhj9Sm+vvYcrmSJunx9C/rHizUv25S/bE4ASVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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