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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9b6d2294ebbc1c11da94a24b9c32453ad4d6b699fa2f23ae76b3fb5fde24888' 
  AND token = 'JC4y+/1SkF395gPu3JrYCggR9i3wreVu/LwvpbP+3PQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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