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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9dc51afb5303fc79201c174e3efdbd38210ab61e9dbacd903a1014373589768' 
  AND token = '//tl1Yqiexn990VTt05F7PeHv/MGS26AA2lCX/jl4L4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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