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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31ff3cec5ea21b8d40cf03109723376c0e95223d5cdda7942e4bf02d24a3b91a' 
  AND token = 'aK7xtW0Lm2Pb7PL9ytQyfA4gTdLdQDZODEZh7qi17WM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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