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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09f7fd84ae3911e8b0adcd9e771fc7693636657343394fa6d44f8e8feeaf23d9' 
  AND token = 'I/HsXBQXvSNvf3tSG1KZa4ryJKVc4IlppnEKArgIEN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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