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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72ee2e33f9628610cb21c93e9ce328fbc2e15cbba00af3e44df3cea27d7530b5' 
  AND token = 'GeoxlOpr9FhtTi+xNhuMXgdqlgXMxmyRRcKwa2oZnPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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