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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20ed6a11cf2f00272237f455c59fc0e73ec4112616f8af214963134e0dbd5b37' 
  AND token = 'HjcEc3JGBsuVIyTiQq/f7X3XyUEgr6HFYNvdM9cNALU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00080

JSON explain

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