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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '429a025fac3b27d9973d7f12b952830f565e49fbbca5e0a30414e193b95b55ae' 
  AND token = 'iTJus3hlhjKAShZKe7Kwaity/Tbx/eAdFvWh/36uf00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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