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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd635f4372cb4ece0c9ce2a6c066817ccd16ab70bd378eb8a4e830beb35169531' 
  AND token = 'b18g20UDrijOPH9Yy/y7HuD/rhEFU1C1CxfI7wPS1Uc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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