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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9695aedc800ffed1afe8c7db67b00022a39537df3c7cc44f3b5b79e0436146a' 
  AND token = 'jy3ggc1B0kWam6C2yy44rJtDk8WFJAxE2yJjOxPaL3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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