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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a87b681bb948036de05318a3ef18b92e8128d5891dff919ec60d6b23474f535' 
  AND token = 'RczrUmYnKOf5EgYqETOdeWVB58dFnltY2l8aCAWEKeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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