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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa9e4eb0c136030026690ecaaf2ba59dd74bb00172134916d07f632f4d626916' 
  AND token = '1+LKHCOBrRbyEmHI3iIlOVQ1SQthUCtQx2wnMUmBapw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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