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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca7ec93d04b5b55e7b45bc6ab0e4f23f9683a09a611109a486b3a7909c5d8861' 
  AND token = 'WONpqukrEd19BPTYQoINO6tgkXSIdCAMBWwwqAS6uDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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