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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a46ce7c31c6084e73a7e7b36bc63a784b977c3a163d4774ef276d82cb058792f' 
  AND token = 'B30i067ziDNK/SkgfwMFfXKNHbKfOIixnrO6co2zMZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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