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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bc1bceb293209592939fc326951d860264e7caf40be8d1aff667f79db264dad' 
  AND token = 'PzlorJk69P8Toknt96SneBHysFnEYfPggykrhDVB114=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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