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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcb1f3d0beaa7559a96d616776bfffd564be9b46b8300872ec95a3c766518ae5' 
  AND token = 'ZHDayUXDIe0aUEpAo4FASlELfzyzkiS/bFoR0usrsRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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