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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61869da163b2b3e6e8ff53264e7275b90d4077f1ebe7d92af02ee19b52d2d7c1' 
  AND token = 'udfHOGKReNDADJSJnYehcD1hAjj5tWKk7HftSrvVlYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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