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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcc85723966ec6f830c28a97c511ec704e1bd94f7cbfff65d11dcfcbd0c13cff' 
  AND token = 'QzSYbwQZrmXfkwfA9BIGS6MdiuQZp24vq0xCy0M3XQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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