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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1846bb6b639730bcb686867f7e2101667179b3f78b5c37e82450932439579ad' 
  AND token = 'cbHVdFi5lCzS30MKSmJwCYIM3nMXoXZrQ4kQaARS6co=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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