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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0b6ae1a1849eecb58c9de1f49b115bf0b95d92c421bcf3a55ee0df4c97a4950' 
  AND token = 'c+Vykjh5ufMGRgQSev5iR572FjsDZMCvpEPnFVAA0VA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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