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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cd3e0b9a12cdeafac43696c92dec31c2c2205b325290e415d81c65b28ec92f9' 
  AND token = '67JhXWs2PhKa/2GFywZLB+b/NPwUU0MS0DEbRlqyTmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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