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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f457cde092435a9d3ccfcbbfa4e096d4a18673b9df708e6ffe6290f7cb40eb93' 
  AND token = 'XssMgYHC2bF+O3qSUUlWT9TFVv0fnV61glu+eMs5et0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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