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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5a05ade7adfa7425573f3b9c74d6904176a4aa8be0cb4398e5ca3614f3f0b6e' 
  AND token = 'UUF5KS+jWBCOeSWsdat7kigQgH/EsgrXLcXtacn7mH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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