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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bacf3ecf03e040c6657ba1cbb7a82c5ffedec89e5f2ab939971af0476d917af' 
  AND token = 'en/cYhwsccYsxevcLP0NBv64pNohRjQT2XZ1FGQyjKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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