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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f89cf1e10d5ad9d85ae8bcee499bbdaefd8c46c66e4fdd4ea3473705389bdf67' 
  AND token = 'sj/4z5qhk4KacEtWA1AuHA0L89OIRGDNBD9NRCtFmCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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