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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0fbd63f09b3b3adde78288926b9945613a959b503bf0406ba78f417ef44e9f9' 
  AND token = 'SZMJKecHWUXRD2p6U1PLj5NWYupuUy1mC+3RkqTa3lc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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