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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b82ddb93029c1b73d4d0040682f2e7131ea0bb278bb060aa8731cab4caedf5af' 
  AND token = 'HiknUQyVyZ3SxqtOt6/8UOnaoemVK0Y9a3cAJ2RcfLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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